Add version warning for wandb (ultralytics#7385)

* add version warning

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Cleanup

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Update __init__.py

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

utils/loggers/__init__.py

@@ -81,6 +81,11 @@ def __init__(self, save_dir=None, weights=None, opt=None, hyp=None, logger=None,
             run_id = torch.load(self.weights).get('wandb_id') if self.opt.resume and not wandb_artifact_resume else None
             self.opt.hyp = self.hyp  # add hyperparameters
             self.wandb = WandbLogger(self.opt, run_id)
+            # temp warn. because nested artifacts not supported after 0.12.10
+            if pkg.parse_version(wandb.__version__) >= pkg.parse_version('0.12.11'):
+                self.logger.warning(
+                    "YOLOv5 temporarily requires wandb version 0.12.10 or below. Some features may not work as expected."
+                )
         else:
             self.wandb = None